Information processing device, access device, recording medium, information processing method, and information processing program

An information processing device for processing specific information recorded on a recording medium, comprising:

• a characteristic identification unit for identifying a reflection characteristic of the recording medium;
• and
• a processing unit for processing the specific information according to the identified reflection characteristic,
• wherein the reflection characteristic indicates that the recording medium has a first characteristic or a second characteristic, the first characteristic being that a reflectance of light reflected by a recorded region of the recording medium, defining a first reflectance, is greater than a reflectance of light reflected by an unrecorded region of the recording medium, defining a second reflectance, the second characteristic being that the first reflectance is less than the second reflectance, and
• the processing unit includes a threshold changing unit for changing a threshold for detecting a defective portion of the recording medium, on the basis of the identified reflection characteristic and a light reflection level corresponding to the identified reflection characteristic.

An optical disk information processing method for processing specific information recorded on a recording medium, comprising:

• reading the specific information recorded on the recording medium;
• identifying a reflection characteristic of the recording medium;
• and
• processing the specific information according to the identified reflection characteristic,
• wherein the reflection characteristic indicates that the recording medium has a first characteristic or a second characteristic, the first characteristic being that a reflectance of light reflected by a recorded region of the recording medium, defining a first reflectance, is greater than a reflectance of light reflected by an unrecorded region of the recording medium, defining a second reflectance, the second characteristic being that the first reflectance is less than the second reflectance, and
• the processing of the specific information includes changing a threshold for detecting a defective portion of the recording medium, on the basis of the identified reflection characteristic and a light reflection level corresponding to the identified reflection characteristic.

An information processing method for processing specific information recorded to a recording medium, comprising:

• identifying a reflection characteristic of the recording medium;
• and
• processing the specific information according to the identified reflection characteristic,
• wherein the reflection characteristic indicates that the recording medium has a first characteristic or a second characteristic, the first characteristic being that a reflectance of light reflected by a recorded region of the recording medium, defining a first reflectance, is greater than a reflectance of light reflected by an unrecorded region of the recording medium, defining a second reflectance, the second characteristic being that the first reflectance is less than the second reflectance, and
• the processing of the specific information includes changing a threshold for detecting a defective portion of the recording medium, on the basis of the identified reflection characteristic and a light reflection level corresponding to the identified reflection characteristic.